How COVID-19 smell, taste loss differs from common cold decoded
London: Although COVID-19 patients may lose their sense of smell, they can breathe freely, do not tend to have a runny or blocked nose, and cannot detect bitter or sweet tastes, a study published on Wednesday has found.
The study is the first to compare how people with COVID-19 smell and taste disorders differ from those with other causes of upper respiratory tract infections, according to the researchers, including those from the University of East Anglia (UEA) in the UK.
The researchers hope that their work could help develop smell and taste tests for fast COVID-19 screening - in primary care and emergency departments.
The findings, published in the journal Rhinology, lend weight to the theory that COVID-19 infects the brain and central nervous system.
"The loss of smell and taste is a prominent symptom of COVID-19, however it is also a common symptom of having a bad cold, said lead researcher Carl Philpott, a professor at UEA's Norwich Medical School.
We wanted to find out exactly what differentiates COVID -19 smell loss with the kind of smell loss you might have with a cold and blocked-up nose," Philpott said.
The research team carried out smell and taste tests on 10 COVID-19 patients, 10 people with bad colds and a control group of 10 healthy people -- all matched for age and sex.
"We wanted to see if their smell and taste test scores could help discriminate between COVID-19 patients and those with a heavy cold, Philpott said.
The researchers noted that COVID-19 behaves differently to other respiratory viruses, for example by causing the body's immune system to over-react, known as a cytokine storm, and by affecting the nervous system.
They found that smell loss was much more profound in the COVID-19 patents, and they were less able to identify smells, and were not able to identify bitter or sweet tastes.
The researchers said it was this loss of true taste which seemed to be present in the COVID-19 patients compared to those with a cold.
"This is very exciting because it means that smell and taste tests could be used to discriminate between COVID-19 patients and people with a regular cold or flu, Philpott said.
"Although such tests could not replace formal diagnostic tools such as throat swabs, they could provide an alternative when conventional tests are not available or when rapid screening is needed -- particularly at the level of primary care, in emergency departments or at airports, he added.
The study also shows that there are altogether different things going on when it comes to smell and taste loss for COVID-19 patients, compared to those with a bad cold, the researchers said.
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RCB pip CSK by two runs in last-ball IPL thriller
Bengaluru: Ayush Mhatre's 94 and Ravindra Jadeja's 77 not out went in vain as Royal Challengers Bengaluru pipped Chennai Super Kings by two runs in their IPL match here on Saturday.
Chasing 214, CSK scored 211 for 5 in their 20 overs.
Mhatre scored a 48-ball 94 with five sixes and nine fours while adding 114 runs with Jadeja (77 not out off 45 balls, 8x4s, 2x6s) for the second wicket.
For RCB, Lungi Ngidi returned with figures of 3/30.
Earlier, half-centuries from Jacob Bethell (55), Virat Kohli (62) and Romario Shepherd (53 not out) took RCB to 213 for five.
While Bethell and Kohli put on 97 runs for the opening wicket to set a platform, Shepherd blasted four fours and six sixes to make 53 not out off only 14 balls, recording the fastest fifty of the season and joint second-fastest overall.
For CSK, Matheesha Pathirana found his rhythm and lengths to return 3-0-36-3.
Brief scores:
RCB: 213 for 5 in 20 overs (Jacob Bethell 55, Virat Kohli 62, Romario Shepherd 53 not out; Matheesha Pathirana 3/36).
CSK: 211 for 5 in 20 overs (Ayush Mhatre 94, Ravindra Jadeja 77 not out; Lungi Ngidi 3/30).
